radeonsi: fix warnings

src/gallium/drivers/radeon/r600_pipe_common.c

@@ -617,6 +617,8 @@ static int r600_get_compute_param(struct pipe_screen *screen,
 			*images_supported = 0;
 		}
 		return sizeof(uint32_t);
+	case PIPE_COMPUTE_CAP_MAX_PRIVATE_SIZE:
+		break; /* unused */
 	}
 
         fprintf(stderr, "unknown PIPE_COMPUTE_CAP %d\n", param);

src/gallium/drivers/radeonsi/si_descriptors.c

@@ -206,7 +206,7 @@ static void si_emit_descriptors(struct si_context *sctx,
 {
 	struct radeon_winsys_cs *cs = sctx->b.rings.gfx.cs;
 	uint64_t va_base;
-	int packet_start;
+	int packet_start = 0;
 	int packet_size = 0;
 	int last_index = desc->num_elements; /* point to a non-existing element */
 	unsigned dirty_mask = desc->dirty_mask;